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<a href="heap__fixed__builder__capnp__msg__builder_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Structured Transport</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright (c) 2023 Akamai Technologies, Inc.; and other contributors.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> * Each commit is copyright by its respective author or author&#39;s employer.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * Licensed under the MIT License:</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> *</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a copy</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * of this software and associated documentation files (the &quot;Software&quot;), to deal</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> * in the Software without restriction, including without limitation the rights</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * copies of the Software, and to permit persons to whom the Software is</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> *</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> *</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment"> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment"> * THE SOFTWARE. */</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"></span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="preprocessor">#include &quot;<a class="code" href="struc__fwd_8hpp.html">ipc/transport/struc/struc_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1transport_1_1struc.html">ipc::transport::struc</a></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>{</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"></span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment">/**</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> * A `capnp::MessageBuilder` used by Heap_fixed_builder: similar to a `capnp::MallocMessageBuilder`</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * with the FIXED_SIZE alloc-strategy but with framing space around the allocated segment(s).</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> *</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * It can also be used as a #Capnp_msg_builder_interface (`capnp::MessageBuilder`) independently of the rest</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * of ipc::transport or even ::ipc, although that was not the impetus for its development.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> *</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> * ### Move-ctible and move-assignable ###</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> * Super-class #Capnp_msg_builder_interface, which is an abstract class but not a pure interface (it has data</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> * and concrete methods), is move-ctible and move-assignable (but not copyable).  Accordingly, the present</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> * class is as well.  (So is our peer `capnp::MallocMessageBuilder`.)  However: as of this writing</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> * (newest version capnp 0.10) #Capnp_msg_builder_interface consists of a raw data area that = 1 `bool` + 22</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * words; or at least 176 bytes in a 64-bit system.  Its (defaulted) move ctor/assignment will thus need to</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * copy the 176+ bytes.  That is a little &quot;fat.&quot;  We add another 3 `size_t`, a pointer, and a `vector` of 1+</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * pointers, or 30+ bytes. Hence the user may wish to wrap us in a `unique_ptr`, and only then use the move</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * semantics; as the trade-off against the extra alloc/dealloc is arguably worth it.  The same arguably holds</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> * for any #Capnp_msg_builder_interface sub-class (interface implementation).</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> *</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * Style note: Much of the rest of the code explicitly documents deleted copy-ctor/assignment and defaulted</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> * move-ctor/assignment (as separate items each with a doc header); we do not.  This is of course for brevity;</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * but we justify it in that the abstract class (interface) we implement (#Capnp_msg_builder_interface) omits them</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * as well.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> *</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> * ### Rationale ###</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> * Why we&#39;d use a `MallocMessageBuilder`-like approach is explained within Heap_fixed_builder doc header.</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> * So why not just use that actual class?  Answer: We send the resulting serialization segments over IPC pipes</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> * (Blob_sender, Native_handle_sender), and in some cases struc::Channel needs to surround the serialization</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> * with a bit of metadata.  `MallocMessageBuilder` will, for each segment, allocate X bytes -- and then potentially</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> * fill all of them.  The only way for struc::Channel to work with this is to allocate another buffer of</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> * X + (frame size) bytes and then copy the X bytes into it -- losing the adherence to the zero-copy-when-possible</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> * paradigm.  Hence this class which will use `flow::util::Blob` machinery to maintain the frame space.</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * (Update: The previous paragraph remains correct in that in order to support the framing feature it was necessary</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * to write this class, as `MallocMessageBuilder` does not have it.  However struc::Channel no longer needs</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * to frame &quot;a bit of metadata&quot; around the serialization; hence it does not require this framing feature; hence</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * we could now get rid of the present class and just use `MallocMessageBuilder`.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * Nevertheless I (ygoldfel) have kept this class around, as it is a nice feature in general.  Plus niceties</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> * like emit_segment_blobs() and n_segments() remain nice.)</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> *</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * Note that in order to make use of the added feature (frame space) one should *not* access the serialization result</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> * via the usual `MessageBuilder::getSegmentsForOutput()`.  That still works, and that method is essential in</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * the impl of this class; but it returns only the actual serialization segments (each one&#39;s start and size,</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> * not including for example the allocated-but-unused data probably at the tail of the allocated buffer).</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * Technically it would indeed be correct/safe to simply write frame prefix data by subtracting `frame_prefix_sz`</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> * from the segment&#39;s start pointer and writing there; and similarly write postfix data immediately past the end of the</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * start ptr + size.  However that is error-prone and inconvenient.  Call emit_segment_blobs() instead: it will return</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> * the `flow::util::Blob`s which will have set `start()` and `size()` appropriately (see emit_segment_blobs()</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * doc header).</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> */</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html">   84</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html">Heap_fixed_builder_capnp_message_builder</a> :</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>  <span class="keyword">public</span> <a class="code hl_class" href="classCapnp__msg__builder__interface.html">Capnp_msg_builder_interface</a></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>{</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span> </div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"></span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">   * Constructs the message-builder, with the policy to allocate the segments in a particular way, always</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">   * with a fixed size.  Namely, capnp will call allocateSegment() with `min_sz * sizeof(word) == M`.  This will:</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment">   *   - Create an internal `flow::util::Blob B` with:</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment">   *     - `capacity()` = `max(M, segment_sz) + frame_prefix_sz + frame_postfix_sz`, up to ceiling-nearest word;</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment">   *     - `start()` = `frame_prefix_sz`.</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">   *     - `size()` = `capacity() - start() - frame_postfix_sz` which equals ~`max(M, segment_sz)`.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   *   - Return `ArrayPtr` pointing at `B.begin()` (which is buffer start + `start()`),</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   *     sized `B.size()` (that is, `max(M, segment_sz)` adjust to ceiling-nearest word).</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   *</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   * Furthermore, this will cause the following emit_segment_blobs() behavior:</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   *   - It will emit a sequence of `flow::util::Blob` pointers to the above.</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   *   - Each `Blob` pointer will correspond to an earlier allocateSegment() call 1-1.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   *   - The pointee&#39;s `start()` will be as above.</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   *   - The pointee&#39;s `size()` will equal the serialization segment&#39;s size as determined ultimately by capnp</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   *     (per `getSegmentsForOutput()`).</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   *     This will be at most `max(M, segment_sz)` (less if it didn&#39;t need every single byte to hold the</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   *     serialization ultimately -- it is typical some bytes are wasted).</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   *   - Its `capacity() - start() - size() &gt;= frame_postfix_sz`.</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   *</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * In this way the consumer of emit_segment_blobs() (presumably struc::Channel) will be able to</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   * adjust `start()` and `size()` of each serialization `Blob` to add framing info if needed.</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">   *</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment">   * @param logger_for_blobs</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">   *        Passed to each `Blob` ctor.</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment">   * @param segment_sz</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   * @param frame_prefix_sz</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   *        Guaranteed space for prefix framing.  See above.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   *        This must be a multiple of `sizeof(void*)`; else behavior undefined (assertion may trip).</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   * @param frame_postfix_sz</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">   *        Guaranteed space for postfix framing.  See above.</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">   */</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a29e45b9263096e876754ea544031242d">Heap_fixed_builder_capnp_message_builder</a></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>             (flow::log::Logger* logger_for_blobs, <span class="keywordtype">size_t</span> segment_sz, <span class="keywordtype">size_t</span> frame_prefix_sz, <span class="keywordtype">size_t</span> frame_postfix_sz);</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment"></span> </div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   * Returns pointers to `Blob`s which are the serialization segments at this time.  They are as follows:</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">   *   - Each `Blob` holds a serialization segment, in order.  There shall be at least 1.</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   *   - For each `Blob B` (see ctor):</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">   *     - `start() == frame_prefix_sz`.</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   *     - `capacity() - start() - size() &gt;= frame_postfix_sz`.</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   *     - [`begin()`, `end()`) is the serialization segment.  Recall that `begin()` starts at position `start()`,</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">   *       while `end()` is at position `start() + size()`.</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">   *</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">   * Therefore one can use `B.resize()` and similar and then add frame data without breaking zero-copy.</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">   *</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">   * This method can be invoked more than once; however the emitted result is meaningless once any mutation occurs</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * subsequently.</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   *</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * @param target_blob_ptrs</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *        It is appended-to.  Recall these are mere pointers (into `*this`-managed heap memory).</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   */</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a478c109e008dd33b04b605278c1b2a54">emit_segment_blobs</a>(<a class="code hl_typedef" href="namespaceipc_1_1transport_1_1struc.html#a82a69eaa39cbe8a002de1266f1cbb5cb">Segment_ptrs</a>* target_blob_ptrs);</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment"></span> </div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">   * Returns what `target_blob_ptrs.size()` would return after calling `emit_segment_blobs(&amp;target_blob_ptrs)` (with</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment">   * an empty `target_blob_ptrs` going-in), right now.  In other words it is the number of times capnp has invoked</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">   * allocateSegment().</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   *</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   */</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a8d4767193250d909cdf5b298f92f43e9">n_segments</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment"></span> </div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   * Implements `MessageBuilder` API.  Invoked by capnp, as the user mutates via `Builder`s.  Do not invoke directly.</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   *</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   * @note The strange capitalization (that goes against standard Flow-IPC style) is because we are implementing</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   *       a capnp API.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   *</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">   * For details as to how this will behave in context of `*this` see Heap_fixed_builder_capnp_message_builder()</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   * ctor doc header.</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   *</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * @param min_sz</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   *        See `MessageBuilder` API.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   *        The allocated segment will allow for a serialization of at most</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   *        `min(min_sz * sizeof(word), segment_sz)` bytes, where `segment_sz` was passed to ctor</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   *        (adjusted to the ceiling-nearest word).</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   * @return See `MessageBuilder` API.</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   *         The ptr and size of the area for capnp to serialize-to.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   *         (As noted in ctor doc header: `frame_prefix_sz` bytes will precede this area, and</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   *         `frame_postfix_sz` will succeed it.)</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   */</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>  kj::ArrayPtr&lt;::capnp::word&gt; <a class="code hl_function" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a766736906354f28d6ef2fa0752ba0e21">allocateSegment</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> min_sz) <span class="keyword">override</span>;</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span> </div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment"></span> </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">  /// See ctor.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ae15044026ef19363177d474c6ac890bc">  183</a></span><span class="comment"></span>  flow::log::Logger* <a class="code hl_variable" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ae15044026ef19363177d474c6ac890bc">m_logger_for_blobs</a>;<span class="comment"></span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">  /// See ctor.</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#af012d6917cdc16494a22b4b6f2c10edd">  185</a></span><span class="comment"></span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#af012d6917cdc16494a22b4b6f2c10edd">m_segment_sz</a>;<span class="comment"></span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">  /// See ctor.</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ac4e465bb2099093f06cd7e969d2e3de6">  187</a></span><span class="comment"></span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ac4e465bb2099093f06cd7e969d2e3de6">m_frame_prefix_sz</a>;<span class="comment"></span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">  /// See ctor.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aa52369c664ada39cedb0a70f08880931">  189</a></span><span class="comment"></span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aa52369c664ada39cedb0a70f08880931">m_frame_postfix_sz</a>;</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment"></span> </div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">   * Before emit_segment_blobs(), stores each segment allocated as requested by capnp via allocateSegment() `virtual`</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   * API, with `.size()` equal to `.capacity()` and &gt;= `min_sz` (arg to that method); immediately after</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   * emit_segment_blobs() each `.size()` is adjusted to indicate the # of bytes actually used in that segment in</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * the final serialization.  In addition the framing requirements (#m_frame_prefix_sz and #m_frame_postfix_sz)</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * are requested.  emit_segment_blobs() yields an equally sized list of pointers to the `.size()`-adjusted per-segment</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   * `Blob`s.</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   */</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aad029fd4e08580a785824c48790c748f">  199</a></span>  std::vector&lt;boost::movelib::unique_ptr&lt;flow::util::Blob&gt;&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aad029fd4e08580a785824c48790c748f">m_serialization_segments_plus_frame_space</a>;</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>}; <span class="comment">// class Heap_fixed_builder_capnp_message_builder</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span> </div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>} <span class="comment">// namespace ipc::transport::struc</span></div>
<div class="ttc" id="aclassCapnp__msg__builder__interface_html"><div class="ttname"><a href="classCapnp__msg__builder__interface.html">Capnp_msg_builder_interface</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder</a></div><div class="ttdoc">A capnp::MessageBuilder used by Heap_fixed_builder: similar to a capnp::MallocMessageBuilder with the...</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00084">heap_fixed_builder_capnp_msg_builder.hpp:86</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_a29e45b9263096e876754ea544031242d"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a29e45b9263096e876754ea544031242d">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::Heap_fixed_builder_capnp_message_builder</a></div><div class="ttdeci">Heap_fixed_builder_capnp_message_builder(flow::log::Logger *logger_for_blobs, size_t segment_sz, size_t frame_prefix_sz, size_t frame_postfix_sz)</div><div class="ttdoc">Constructs the message-builder, with the policy to allocate the segments in a particular way,...</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8cpp_source.html#l00034">heap_fixed_builder_capnp_msg_builder.cpp:35</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_a478c109e008dd33b04b605278c1b2a54"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a478c109e008dd33b04b605278c1b2a54">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::emit_segment_blobs</a></div><div class="ttdeci">void emit_segment_blobs(Segment_ptrs *target_blob_ptrs)</div><div class="ttdoc">Returns pointers to Blobs which are the serialization segments at this time.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8cpp_source.html#l00042">heap_fixed_builder_capnp_msg_builder.cpp:42</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_a766736906354f28d6ef2fa0752ba0e21"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a766736906354f28d6ef2fa0752ba0e21">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::allocateSegment</a></div><div class="ttdeci">kj::ArrayPtr&lt;::capnp::word &gt; allocateSegment(unsigned int min_sz) override</div><div class="ttdoc">Implements MessageBuilder API.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8cpp_source.html#l00086">heap_fixed_builder_capnp_msg_builder.cpp:86</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_a8d4767193250d909cdf5b298f92f43e9"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#a8d4767193250d909cdf5b298f92f43e9">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::n_segments</a></div><div class="ttdeci">size_t n_segments() const</div><div class="ttdoc">Returns what target_blob_ptrs.size() would return after calling emit_segment_blobs(&amp;target_blob_ptrs)...</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8cpp_source.html#l00135">heap_fixed_builder_capnp_msg_builder.cpp:135</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_aa52369c664ada39cedb0a70f08880931"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aa52369c664ada39cedb0a70f08880931">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::m_frame_postfix_sz</a></div><div class="ttdeci">const size_t m_frame_postfix_sz</div><div class="ttdoc">See ctor.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00189">heap_fixed_builder_capnp_msg_builder.hpp:189</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_aad029fd4e08580a785824c48790c748f"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#aad029fd4e08580a785824c48790c748f">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::m_serialization_segments_plus_frame_space</a></div><div class="ttdeci">std::vector&lt; boost::movelib::unique_ptr&lt; flow::util::Blob &gt; &gt; m_serialization_segments_plus_frame_space</div><div class="ttdoc">Before emit_segment_blobs(), stores each segment allocated as requested by capnp via allocateSegment(...</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00199">heap_fixed_builder_capnp_msg_builder.hpp:199</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_ac4e465bb2099093f06cd7e969d2e3de6"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ac4e465bb2099093f06cd7e969d2e3de6">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::m_frame_prefix_sz</a></div><div class="ttdeci">const size_t m_frame_prefix_sz</div><div class="ttdoc">See ctor.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00187">heap_fixed_builder_capnp_msg_builder.hpp:187</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_ae15044026ef19363177d474c6ac890bc"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#ae15044026ef19363177d474c6ac890bc">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::m_logger_for_blobs</a></div><div class="ttdeci">flow::log::Logger * m_logger_for_blobs</div><div class="ttdoc">See ctor.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00183">heap_fixed_builder_capnp_msg_builder.hpp:183</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder_html_af012d6917cdc16494a22b4b6f2c10edd"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Heap__fixed__builder__capnp__message__builder.html#af012d6917cdc16494a22b4b6f2c10edd">ipc::transport::struc::Heap_fixed_builder_capnp_message_builder::m_segment_sz</a></div><div class="ttdeci">const size_t m_segment_sz</div><div class="ttdoc">See ctor.</div><div class="ttdef"><b>Definition:</b> <a href="heap__fixed__builder__capnp__msg__builder_8hpp_source.html#l00185">heap_fixed_builder_capnp_msg_builder.hpp:185</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1struc_html"><div class="ttname"><a href="namespaceipc_1_1transport_1_1struc.html">ipc::transport::struc</a></div><div class="ttdoc">Sub-module of Flow-IPC module ipc::transport providing transmission of structured messages specifical...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__transport__structured_2src_2ipc_2transport_2struc_2channel_8cpp_source.html#l00030">channel.cpp:31</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1struc_html_a82a69eaa39cbe8a002de1266f1cbb5cb"><div class="ttname"><a href="namespaceipc_1_1transport_1_1struc.html#a82a69eaa39cbe8a002de1266f1cbb5cb">ipc::transport::struc::Segment_ptrs</a></div><div class="ttdeci">std::vector&lt; flow::util::Blob * &gt; Segment_ptrs</div><div class="ttdoc">Sequence of 1+ Blob pointers to blobs which must stay alive while these pointers may be dereferenced,...</div><div class="ttdef"><b>Definition:</b> <a href="struc__fwd_8hpp_source.html#l00122">struc_fwd.hpp:122</a></div></div>
<div class="ttc" id="astruc__fwd_8hpp_html"><div class="ttname"><a href="struc__fwd_8hpp.html">struc_fwd.hpp</a></div></div>
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